The invention belongs to the technical field of a multi-channel pulse amplitude analyzer, and particularly relates to a digital current multichannel parallel quick current pre-discharging system. Thesystem is mainly composed of a power supply part circuit and a current pulse signal amplifying circuit part. The power supply part comprises two symmetric parts, wherein the two symmetric parts are composed of a positive power supply input and a negative power supply input. The positive power supply input and the negative power supply input are connected with a pi-type LC filter circuit, and are connected with an electronic filter circuit. The positive power supply input and the negative power supply input are respectively connected with a positive power supply chip and a negative power supplychip. The positive power supply chip and the negative power supply chip are connected with operation amplifier power supply decoupling circuits. The two operation amplifier power supply decoupling circuits are connected with the current pulse signal amplifying circuit part. The system supplies lossless readout and amplification of an original fast current signal of a photoelectric converter in the system. On the condition of an ultrahigh-speed current signal, signal amplification is realized, and furthermore the time characteristic and the amplitude characteristic of the original time are wholly kept, thereby laying a basic for time spectrum measurement for digital current multiple channels.